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US 7,125,536 B2Granted
Nano-structured particles with high thermal stability
AssigneeMillennium Inorganic Chemicals, Inc.
InventorsGuoyi Fu, BillieJo Monk, Corinne Lehaut
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AssigneeMillennium Inorganic Chemicals, Inc.
InventorsGuoyi Fu, BillieJo Monk, Corinne Lehaut
Estimating the term…
This invention relates to a composition comprising nano-structured metal oxide particles (particularly, zirconia) and at least one stabilizing agent, a method to produce the composition, and a method to produce the thermally stable nano-structured particles. The method to produce the nano-structured particles comprises first preparing a base solution and a nanoparticle precursor solution, then combining these solutions at a final pH 7 or greater to precipitate a colloidal hydrous oxide. The colloidal hydrous oxide is then treated with at least one silicate, phosphate, or aluminum phosphate stabilizing agent and dried. These nano-structured particle products have high thermal stability and are particularly advantageous in applications as catalysts or catalyst supports that operate at high temperatures.
A composition comprised of nano-structured metal oxide particles and at least one stabilizing agent, wherein said nano-structured metal oxide particles have a surface area of greater than or equal to 50 m2/g, are comprised of primary particles in the size range of 5 nm to 50 nm and are mesoporous, having a pore size distribution between 2 nm and 30 nm, wherein said nano-structured metal oxide particles are thermally stable at a temperature of at least 600° C. for at least 6 hours, and wherein said stabilizing agent is selected from the group consisting of silicate, phosphate, and aluminum phosphate.
A method of producing a composition comprised of nanoparticle and at least one stabilizing agent, said method comprising aging nanoparticle precursors in a liquid suspension at a temperature of greater than or equal to 60° C. while maintaining a pH of greater than or equal to pH 7 and adding at least one stabilizing agent selected from the group consisting of silicate, phosphate, and aluminum phosphate.
A method of producing thermally stable nano-structured particles comprising:
Dependencies are inferred from the claim text.